 /*******************************************************************************
  * Copyright (c) 2004, 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.activities;

 import java.util.Set ;

 /**
  * The trigger point advisor is a mechanism provided by the workbench that is
  * consulted whenever code that is considered a trigger point is hit. It is the
  * role of the advisor to determine what, if any, activities should be enabled
  * as a consequence of this action. The advisor also has the option of vetoing
  * the operation.
  *
  * <p>
  * This interface is not intended to be extended or implemented by clients.
  * </p>
  *
  * @since 3.1
  * @see org.eclipse.ui.activities.ITriggerPoint
  */
 public interface ITriggerPointAdvisor {

     /**
      * Answer whether the activities bound to the identifier should be enabled
      * when triggered by the provided trigger point.
      *
      * @param triggerPoint
      * the trigger point to test
      * @param identifier
      * the identifier to test against the trigger point
      * @return the set of activities to enable. If the set is not
      * <code>null</code> the caller may proceed with their usage of
      * the object represented by the identifier. If <code>null</code>
      * the caller should abort the action.
      */
     Set allow(ITriggerPoint triggerPoint, IIdentifier identifier);
 }

